Secondary Node RLF Reporting for Fast MCG Recovery Failure
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Solution Overview
Problem
Existing wireless communication systems lack adequate failure reporting procedures for dual connectivity scenarios, particularly when the secondary cell group (SCG) is deactivated, leading to failed fast MCG recovery and increased interruption times due to incomplete information about radio link failures in the master cell group (MCG).
Innovation Solution
Implement methods for the secondary node (SN) to receive radio link failure (RLF) reports via enhanced XnAP messages, including indications of fast MCG recovery failure and SCG status, allowing the SN to optimize its activation/deactivation parameters for improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If SCG is deactivated to reduce device complexity or save resources, then device complexity is reduced, but RLF reporting capability is lost leading to increased interruption time
Solution Approach 1:
The patent introduces the Master Node (MN) as an intermediary that receives RLF reports from the wireless device and forwards them to the Secondary Node (SN) even when SCG is deactivated. This mediator ensures that failure information is still transmitted to the SN without requiring SCG to be active, thus resolving the contradiction between SCG deactivation and RLF reporting capability.
2Loss of time
If fast MCG recovery is implemented to reduce interruption time, then interruption time is reduced, but failure reporting completeness deteriorates when SCG is deactivated
Solution Approach 1:
The Master Node acts as an intermediary that preserves RLF report completeness by forwarding failure information to the Secondary Node even when SCG is deactivated. This ensures that fast MCG recovery can proceed with complete failure information available at both MN and SN, eliminating the information loss problem.
Solution Approach 2:
The patent establishes a feedback mechanism where the Master Node receives RLF reports from the wireless device and actively forwards them to the Secondary Node. This feedback loop ensures that failure information flows to the appropriate node (SN) even when the SCG is in deactivated state, maintaining report completeness.
3Productivity
If SCG activation/deactivation is implemented to optimize resource usage, then resource efficiency is improved, but MCG recovery success rate deteriorates due to incomplete failure information
Solution Approach 1:
The Master Node serves as an intermediary that decouples SCG activation/deactivation status from RLF reporting functionality. It ensures that failure information is forwarded to the Secondary Node regardless of SCG state, thereby maintaining MCG recovery success rate while preserving SCG activation/deactivation flexibility for resource optimization.
Solution Approach 2:
The patent implements a feedback mechanism where the Master Node actively forwards RLF reports to the Secondary Node, ensuring that failure information is always available for optimization decisions. This feedback loop maintains reliability of MCG recovery while allowing SCG to be deactivated for resource efficiency.
Data Source
AI summary
A first network node configured to communicate wireless device(s) (WD). The WD is configured with a dual connectivity (DC) configuration including at least one parameter usable to communicate with a master node (MN) and a secondary node (SN). The first network node is configured to determine that the WD has lost connectivity with the MN, where the WD has declared a radio link failure (RLF) in the MCG, and receive an RLF Report from a third network node at which a communication re-establishment attempt was made in response to the RLF and/or a fourth network node at which the RLF Report was fetched. Upon identifying the RLF report includes information about the RLF occurring while a fast MCG recovery was configured and the SCG had an SCG status, the RLF report is forwarded to the SN including information about a fast MCG recovery failure.